/Engine/Source/Runtime/Datasmith/CADKernel/Public/CADKernel/Geo/Curves/RestrictionCurve.h
A curve can be degenerated in 3D and not in 2D in the case of locally degenerated carrier surface.
void CheckIfDegenerated ( const [FLinearBoundary](API\Runtime\CADKernel\CADKernel\Math\FLinearBoundary) & InBoundary, bool & bDegeneration2D, bool & bDegeneration3D, double & Length3D ) const